01-13-2020, 12:24 PM
This is what mr. Cicala writes:
"And a new thing we hadn’t seen before. The ports under the filter ring are covered with a breathable filter. This would let air pass through as needed but would filter out dust particles. Nicely done."
So, I maintain what I said above. Non-extending lenses do move AF groups which WILL push/pull air, and which WILL get dust in at some point. This extended lens has a special seal that lets air through, but no dust particles.
"And a new thing we hadn’t seen before. The ports under the filter ring are covered with a breathable filter. This would let air pass through as needed but would filter out dust particles. Nicely done."
So, I maintain what I said above. Non-extending lenses do move AF groups which WILL push/pull air, and which WILL get dust in at some point. This extended lens has a special seal that lets air through, but no dust particles.